<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>事件三要素</title>
	</head>
	<body>
		<input type="button" value="点我" onclick="show()" />
		
		<script>
			var show=function(){
				alert("好");
			}
		</script>
	</body>
</html>
